middle of a city. >> at present, there are 11 ports that handle lng tankers in the u.s. the one in boston is in the heart of the city. candace is an expert in maritime terrorism. her reform has revealed that lng tankers could become a target for future terrorist attacks. >> the most likely scenario would be you would have an officer who would have quite a few years experience under his belt, familiar with the environments at sea, and has become radicalized and now has a suicide mission planned. >> a suicide mission in a city harbor would be catastrophic, affecting tens of thousands. m.i.t. professor and former chairman of the massachusetts port authority, james fay, published a report outlining the dangers of an lng explosion in boston harbor. >> you just have to look at the population of people out of doors in a space like this. anyone within a half mile of the water fronlt could be hurt. >> 2015, boston harbor. a 1,000-foot tanker carrying lng sails at five knots into boston harbor, nearby downtown and logan airport, all densely populated. as is normal when an lng tank